[breaking bug] Cannot login after latest PAM update

[pebcak]

There is also this thread discussing this issue:

Watch out: `pam` 1.4.0 may require manual intervention (pam_tally dropped)

pam has been updated and the tally and tally2 modules were dropped. If these modules are present in your /etc/pam.d/system-login then your login will fail despite a correct user/pass (both in DM and terminal). If you have altered the file contents in the past (e.g. you set up login via fingerprint reader) then pacman won’t replace it with the new version. If you don’t make the change before rebooting then entering single-user mode (or using a chroot) will get you into the system, where you can…